Author: Michal Vyskocil <[email protected]>
Branch:
Changeset: r3201:93d6970fc206
Date: 2019-01-10 13:28 +0100
http://bitbucket.org/cffi/cffi/changeset/93d6970fc206/
Log: Define and raise specific hierarchy of exceptions
* PkgConfigNotFound - not installed
* PkgConfigError - base pkg-config errors
* PkgConfigModuleNotFound - pc file for module was not found
* PkgConfigModuleVersionNotFound - requested version was not found
Boilerplate now looks ``` from cffi.error import PkgConfigNotFound,
PkgConfigError ... try: # try pkg-config way
ffibuilder.set_source(..., pkgconfig=["libczmq >= 4.0.0"]) except
PkgConfigNotFound as e: # if pkg-config is not installed, try backup
ffibuilder.set_source(..., libraries=["czmq", "zmq", "uuid", "pgm"])
except PkgConfigError as e: # here we catch both
PkgConfigModuleNotFound and PkgConfigModuleVersionNotFound # and
raise it again - simply to show they are raised raise e from None
```
diff --git a/cffi/error.py b/cffi/error.py
--- a/cffi/error.py
+++ b/cffi/error.py
@@ -21,3 +21,15 @@
""" An error raised when incomplete structures are passed into
cdef, but no verification has been done
"""
+
+class PkgConfigNotFound(Exception):
+ """ An error raised when pkgconfig was not found"""
+
+class PkgConfigError(Exception):
+ """ Generic super class for pkg-config related errors"""
+
+class PkgConfigModuleNotFound(PkgConfigError):
+ """ Module or it's pkg-config file was not found on a system"""
+
+class PkgConfigModuleVersionNotFound(PkgConfigError):
+ """ Requested version of module was not found"""
diff --git a/cffi/pkgconfig.py b/cffi/pkgconfig.py
--- a/cffi/pkgconfig.py
+++ b/cffi/pkgconfig.py
@@ -1,7 +1,11 @@
# pkg-config, https://www.freedesktop.org/wiki/Software/pkg-config/
integration for cffi
import subprocess
import sys
+import re
+from .error import PkgConfigNotFound
+from .error import PkgConfigModuleVersionNotFound
+from .error import PkgConfigError
def merge_flags(cfg1, cfg2):
"""Merge values from cffi config flags cfg2 to cf1
@@ -19,11 +23,29 @@
def call(libname, flag):
- """Calls pkg-config and returing the output"""
+ """Calls pkg-config and returing the output if found
+ """
a = ["pkg-config", "--print-errors"]
a.append(flag)
a.append(libname)
- return subprocess.check_output(a)
+ pc = None
+ try:
+ pc = subprocess.Popen(a, stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
+ except FileNotFoundError:
+ pass
+ if pc is None:
+ raise PkgConfigNotFound("pkg-config was not found on this system")
+
+ bout, berr = pc.communicate()
+ if berr is not None:
+ err = berr.decode(sys.getfilesystemencoding())
+ if re.search("Package .* was not found in the pkg-config search path",
err, re.MULTILINE) is not None:
+ raise PkgConfigNotFoundError(err)
+ elif re.search("Requested '.*' but version of ", err, re.MULTILINE):
+ raise PkgConfigModuleVersionNotFound(err)
+ else:
+ PkgConfigError(err)
+ return bout
def flags(libs):
@@ -38,8 +60,11 @@
extra_link_args are extended with an output of pkg-config for libfoo and
libbar.
- Raise `FileNotFoundError` if pkg-config is not installed or
- `subprocess.CalledProcessError` if pkg-config fails.
+ Raises
+ * PkgConfigNotFound if pkg-config is not installed
+ * PkgConfigModuleNotFound if requested module not found
+ * PkgConfigModuleVersionNotFound if requested version does not match
+ * PkgConfigError for all other errors
"""
subprocess.check_output(["pkg-config", "--version"])
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